Police used a helicopter to search for a suspect, who they believe knew the victims.

Police announced later Thursday night a 17-year-old suspect had been arrested and charged with malicious wounding. Police are not identifying the suspect because the person is a juvenile.

During the earlier search for the suspect, three schools were briefly on lock-in status because of the police activity outside: Mount Vernon Community School, Matthew Maury Elementary School and George Washington Middle School. It was not immediately clear if there were students at the schools. The school district's central office also briefly was on a lock-in status.